GPv2VaultRelayer API
The GPv2VaultRelayer contract serves as an intermediary between CoW Protocol’s settlement system and Balancer Vault, facilitating fund transfers and swap execution with protocol fees.
State Variables
address public immutable creator;
IVault public immutable vault;
Access Control
modifier onlyCreator {
require(msg.sender == creator, "GPv2: not creator");
_;
}
onlyCreator modifier.
Functions
transferFromAccounts
Moves sell token amounts from user accounts to the settlement contract.
function transferFromAccounts(
GPv2Transfer.Data[] calldata transfers
) external onlyCreator;
| Balance Type | Description |
|---|
| ERC20 | Standard ERC20 token transfers |
| External | Balancer Vault external balances |
| Internal | Balancer Vault internal balances |
batchSwapWithFee
Executes multi-step swaps through Balancer pools and simultaneously collects protocol fees.
function batchSwapWithFee(
IVault.BatchSwapStep[] calldata swaps,
IERC20[] calldata tokens,
IVault.FundManagement calldata funds,
int256[] calldata limits,
uint256 deadline,
GPv2Transfer.Data calldata feeTransfer
) external onlyCreator returns (int256[] memory tokenDeltas);
| Name | Type | Description |
|---|
swaps | BatchSwapStep[] | Batch swap steps to execute |
tokens | IERC20[] | Token addresses involved |
funds | FundManagement | Fund management configuration |
limits | int256[] | Maximum token amounts |
deadline | uint256 | Transaction deadline |
feeTransfer | Transfer.Data | Fee collection transfer |
int256[] - Token deltas indicating amounts sent and received.
The function handles both sell orders (GIVEN_IN) and buy orders (GIVEN_OUT) swap kinds.
Security
- Access restricted exclusively to the creator through
onlyCreator
- Unauthorized calls revert with
"GPv2: not creator"
- Immutable state prevents tampering
- Users never interact with this contract directly
Last modified on March 4, 2026
